class1 = {11:'zhangsan', 22:'lisi', 13:'wangwu',41:'lisi'}
print(type(class1))
traverse(class1)

class1[44] = 'wangjiu'
class1.__setitem__(11,'zhangsi') 
class1[22] = 'liwu'
traverse(class1)


class1.__delitem__(22)
del class1[11]
traverse(class1)


s = class1.pop(13,'noname')
print(s)